Math Problem Statement

Given the function f(x) = 3[-2(x + 4)]^2 - 1, determine the vertical translation, horizontal translation, stretch/compression, and reflection.

Solution

Let's break down the given function f(x)=3[2(x+4)]21f(x) = 3[-2(x + 4)]^2 - 1 and answer the questions on the chart.

  1. Parent Graph:

    • The parent function is f(x)=x2f(x) = x^2, which is a standard quadratic function (a parabola).
  2. Vertical Translation:

    • The function has a vertical shift of 1-1, which means the graph moves down by 1 unit.
  3. Horizontal Translation:

    • Inside the function, we have (x+4)(x + 4). This represents a horizontal shift to the left by 4 units.
  4. Stretch/Compress (Vertical):

    • The coefficient of 3 outside the squared term indicates a vertical stretch by a factor of 3.
  5. Stretch/Compress (Horizontal):

    • The factor 2-2 inside the squared term represents a horizontal compression by a factor of 12\frac{1}{2} (since 2|2| is the horizontal compression factor).
  6. Flipped?

    • The negative sign inside the squared term indicates a reflection across the y-axis (upside down along the horizontal axis).

Summary for the chart:

  • Vertical Translation: The graph moved down 1 unit.
  • Horizontal Translation: The graph moved left 4 units.
  • Vertical Stretch: The graph is stretched vertically by a factor of 3.
  • Horizontal Compression: The graph is compressed horizontally by a factor of 2.
  • Flipped: The graph is reflected (flipped upside down).

Would you like more details or clarification on any of the transformations?

Here are 5 related questions:

  1. How would the graph change if the coefficient outside was negative, like 3-3?
  2. What would happen if the horizontal shift was (x4)(x - 4) instead of (x+4)(x + 4)?
  3. How do you identify vertical versus horizontal stretches or compressions in a function?
  4. How can you determine the direction of a graph’s flip based on its equation?
  5. What does the general form a(xh)2+ka(x - h)^2 + k tell you about transformations?

Tip: Always check both inside and outside the function to identify horizontal and vertical transformations separately.

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Math Problem Analysis

Mathematical Concepts

Quadratic Functions
Transformations
Algebra

Formulas

f(x) = a[b(x - h)]^2 + k
General transformation formula for quadratic functions

Theorems

Transformation rules for quadratic functions

Suitable Grade Level

Grades 9-12